Nanoporosity improves the damage tolerance of nanostructured tantalum nitride coatings

作者：Xu, Song; Xu, Jiang^*; Munroe, Paul; Xie, Zong-Han

来源：Scripta Materialia, 2017, 133: 86-91.

DOI：10.1016/j.scriptamat.2017.02.008

• Porous material
• Damage-tolerant
• Nanocrystalline material
• Mechanical properties

Conventionally, nanostructured ceramics are susceptible to brittle fracture due to processing-induced flaws such as porosity. In this study, the microstructure and deformation behavior of two nanostructured Ta2N coatings, one with a fully-dense structure and the other with a nanoporous structure, both prepared by double cathode glow discharge technique, were investigated. It was found that the elastic modulus of the Ta2N coatings is more sensitive to the presence of nanoporosity than their hardnesses. Compared with the fully-dense Ta2N coating, the nanoporous Ta2N coating exhibits a marked increase in the damage tolerance, as well as a good potential for wear-resistance.

• 出版日期2017-5
• 单位南京航空航天大学; 武汉工程大学